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Work is simply a transfer of energy. Calculate the kinetic energy for both speeds, then calculate the difference. The formula for kinetic energy is KE = (1/2)mv2. If the mass is in kilograms, and the velocity (or speed) is in meter/second, the energy is in Joule.

Q: How much work has to be done on a 5 kg sled to increase its speed from 10 m s to 15 m s?

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Use Newton's Second Law: F = ma. Since the data is given in standard SI units, the result will also be in kg.

I,ve raced almost every stock sled out there and been in front every time! from a dead stop,or rolling. Very fast machines, my 98 xcr 700 is stupid fast too!

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There is a big difference between a power sled and a speed sled. The power speed sled is generally bigger, heavier, can accommodate more weight. It also has handles to assist in resistance training.

Either the friction or density of the snow.

Speed sleds are used to improve acceleration when running. The speed sled training improves the burst speed of your leg muscles.

A speed sled is a sled that can be attached to several weights. The sled is then harnessed to a runner's body while he runs. It is intended to improve endurance and acceleration for professional runners. It is not used at all in luge or bobsledding.

On clubpenguin the toboggan does nothing really special but if you buy it then you can use it in a sled race. But to use it you must buy it, then you click on your penguin card and you click on the toboggan in your inventory and then you are holding it. then you enter a sled race and you can see you penguin riding a toboggan. NOTE: this does not increase or decrease your speed during a sled race.

With a power sled you can develop strength in many areas. Such as speed, endurance, strength and leg strength.

What type sled?

Any traditional track and field surface should be good for a speed sled.You just need to know that the heavier you make the sled the more likely you are to gain dangerous momentum.

They run all year and slowly increase their distance and speed each time they run. ( they are still using a sled to pull the musher)

The velocity may increase if the sledge is accelerating. The momentum will increase as it is related to the velocity. The kinetic energy will also increase.